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1,469
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1,402
texts
51
images
12
movies
2
audio
2
software
Topics & Subjects
1,166
ERIC Archive
1,166
Long Range Planning
449
Higher Education
231
Educational Planning
231
Futures (of Society)
230
Community Colleges
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Collection
1,165
Education Resources Information Center (ERIC) Archive
159
Defense Technical Information Archive
51
NASA Images
30
Planetary Photo Journal Collection
20
The ARCHIVE.ORG Manual Library
20
Solar System Collection
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Creator
1,166
eric
159
defense technical information center
30
nasa/johns hopkins university applied physics laboratory/southwest research institute
20
nasa
18
nasa technical reports server (ntrs)
6
mit opencourseware
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1,412
English
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